/**
 * BibSonomy-Scraper - Web page scrapers returning BibTeX for BibSonomy.
 *
 * Copyright (C) 2006 - 2016 Knowledge & Data Engineering Group,
 *                               University of Kassel, Germany
 *                               http://www.kde.cs.uni-kassel.de/
 *                           Data Mining and Information Retrieval Group,
 *                               University of Würzburg, Germany
 *                               http://www.is.informatik.uni-wuerzburg.de/en/dmir/
 *                           L3S Research Center,
 *                               Leibniz University Hannover, Germany
 *                               http://www.l3s.de/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.bibsonomy.scraper.ie;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;

import javax.naming.NamingException;

import edu.umass.cs.mallet.base.fst.CRF4;

/**
 * stores the Conditional Random Field for Information Extraction with mallet
 */
public class CRFSingleton {
		
	private static final String CRF_DAT = "crf.dat";
	private static CRF4 crf = null;
	
	public CRFSingleton() throws FileNotFoundException, IOException, NamingException, ClassNotFoundException {
		if(crf == null){
			// get path to crf file and read crf
			ObjectInputStream ois = new ObjectInputStream(this.getClass().getResourceAsStream(CRF_DAT));
			crf = (CRF4) ois.readObject();
			ois.close();
		}		
	}
		
	public CRF4 getCrf(){
		return crf;
	}

}


